foo.cc: In function 'int main()':
foo.cc:25:2: warning: statement has no effect [-Wunused-value]
   25 | y==0;
      | ~^~~
foo.cc:36:7: warning: 'y' may be used uninitialized in this function [-Wmaybe-uninitialized]
   36 | cout<<y;
      |       ^

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